Regarding the skirt support of vertical vessels
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If the ratio of the cylinder length L to the nominal diameter DN of a vertical pressure vessel is greater than 5, it is not appropriate to use either JB/T4712.2-2007 \"Leg-type Supports\" or JB/T4712.4-2007 \"Support-type Supports\"; instead, skirt-type supports should be used. In this case, calculation can be carried out with reference to NB/T 47041-2014 \"Tower-Type Containers\". So, should the reference standard in the design data sheet for the general layout indicate a reference to NB/T47041-2014? Are there any other more suitable design methods?
In my opinion, since the value is greater than 5, it should be designed according to 47041, as 47041 already removes the 10m height restriction.
But this container is not a tower-type container...
In my personal view, structures with a large height-to-diameter ratio should be called towers; it’s not only those in which chemical reactions play a role in forming the tower structure that can be referred to as towers, and only such structures can apply to standard 47041.
Yes, it can be calculated based on tower equipment. Of course, it is also possible to refer to the leg standards and use legs that are one size larger. It’s best to learn finite element analysis and conduct a rough analysis. Or learn to use SolidWorks; it also has simulation analysis, and basic calculations are sufficient.
Pressure vessels with a general height and diameter greater than 5 can be designed as towers; those capable of supporting skirt bases of types NB47041, JB4710, and HG20652 are suitable for this purpose. The relevant standards can be downloaded from this website: http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=10474
You can use this standard: HG20652-1998 Technical Specifications for Tower Design. We use this standard whenever a skirt base is involved
So, should the reference standard in the design data sheet for the general layout indicate a reference to NB/T47041-2014?
1. Of course. 2. For structures with a height of 10 m or less, even if the height-to-diameter ratio is greater than 5, they still meet the requirements of NBT47003.1 (provided that other conditions such as medium toxicity are also satisfied); in such cases, NBT47003.1 can be applied, but the calculations should be carried out using the standards for towers specified in NBT47041 and similar standards. It is not necessary to specify this in the characteristic table, as everything is designed, manufactured, and inspected in accordance with 47003.1, except for the calculations related to the skirt base.
It is possible to cite the standards for towers, as I have worked on similar storage tanks before; their length-to-diameter ratio is less than 5, but since a skirt was used, the calculations were still done according to tower design principles